AVR221: Discrete PID Controller on tinyavr and megaavr devices. Introduction. AVR 8-bit Microcontrollers APPLICATION NOTE

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1 AVR 8-bit Microcontrollers AVR221: Discrete PID Controller on tinyavr and megaavr devices APPLICATION NOTE Introduction This application note describes a simple implementation of a discrete Proportional- Integral-Derivative (PID) controller. When working with applications where control of the system output due to changes in the reference value or state is needed, implementation of a control algorithm may be necessary. Examples of such applications are motor control, control of temperature, pressure, flow rate, speed, force, or other variables. The PID controller can be used to control any measurable variable, as long as this variable can be affected by manipulating some other process variables. Many control solutions have been used over the time, but the PID controller has become the industry standard due to its simplicity and good performance. For further information about the PID controller and its implications, the reader should consult other sources, e.g. PID Controllers by K. J. Astrom & T. Hagglund (1995). Figure -1. Typical PID Regulator Response to Step Change in Reference Input p pi pid ref

2 Features Simple discrete PID controller algorithm Supported by all Atmel AVR devices PID function uses 534 bytes of code memory and 877 CPU cycles (IAR - low size optimization) 2

3 Table of Contents Introduction...1 Features PID Controller Proportional Term Integral Term Derivative Term Proportional, Integral, and Derivative Terms Together Tuning the Parameters Discrete PID Controller Algorithm Background Implementation Integral Windup Further Development Literature References Revision History...13

4 1. PID Controller In the figure below a schematic of a system with a PID controller is shown. The PID controller compares the measured process value y with a reference setpoint value, y 0. The difference or error, e, is then processed to calculate a new process input, u. This input will try to adjust the measured process value back to the desired setpoint. The alternative to a closed loop control scheme such as the PID controller is an open loop controller. Open loop control (no feedback) is in many cases not satisfactory, and is often impossible due to the system properties. By adding feedback from the system output, performance can be improved. Figure 1-1. Closed Loop System with PID Controller y0 e - PID u System y Unlike simple control algorithms, the PID controller is capable of manipulating the process inputs based on the history and rate of change of the signal. This gives a more accurate and stable control method. The basic idea is that the controller reads the system state by a sensor. Then it subtracts the measurement from a desired reference to generate the error value. The error will be managed in three ways; to handle the present through the proportional term, recover from the past using the integral term, and to anticipate the future through the derivate term. The figure below shows the PID controller schematics, where T p, T i, and T d denote the time constants of the proportional, integral, and derivative terms respectively. Figure 1-2. PID Controller Schematic T d d dt e K p u T i 1.1. Proportional Term The proportional term (P) gives a system control input proportional with the error. Using only P control gives a stationary error in all cases except when the system control input is zero and the system process value equals the desired value. In the figure below the stationary error in the system process value appears after a change in the desired value (ref). Using a too large P term gives an unstable system. 4

5 Figure 1-3. Step Response P Controller 12 p ref Integral Term The integral term (I) gives an addition from the sum of the previous errors to the system control input. The summing of the error will continue until the system process value equals the desired value, and this results in no stationary error when the reference is stable. The most common use of the I term is normally together with the P term, called a PI controller. Using only the I term gives slow response and often an oscillating system. The figure below shows the step responses to a I and PI controller. As seen the PI controller response have no stationary error and the I controller response is very slow. Figure 1-4. Step Response I and PI Controller p i pi ref Derivative Term The derivative term (D) gives an addition from the rate of change in the error to the system control input. A rapid change in the error will give an addition to the system control input. This improves the response to a sudden change in the system state or reference value. The D term is typically used with the P or PI as a PD or PID controller. A too large D term usually gives an unstable system. The figure below shows D and PD controller responses. The response of the PD controller gives a faster rising system process value 5

6 than the P controller. Note that the D term essentially behaves as a high-pass filter on the error signal and thus easily introduces instability in a system and make it more sensitive to noise. Figure 1-5. Step Response D and PD Controller p d pd ref Proportional, Integral, and Derivative Terms Together Using all the terms together, as a PID controller usually gives the best performance. The figure below compares the P, PI, and PID controllers. PI improves the P by removing the stationary error, and the PID improves the PI by faster response and no overshoot. Figure 1-6. Step Response P, PI, and PID Controller p pi pid ref Tuning the Parameters The best way to find the needed PID parameters is from a mathematical model of the system, parameters can then be calculated to get the desired response. Often a detailed mathematical description of the system is unavailable, experimental tuning of the PID parameters has to be performed. Finding the terms for the PID controller can be a challenging task. Good knowledge about the systems properties and the 6

7 way the different terms work is essential. The optimum behavior on a process change or setpoint change depends on the application at hand. Some processes must not allow overshoot of the process variable from the setpoint. Other processes must minimize the energy consumption in reaching the setpoint. Generally, stability is the strongest requirement. The process must not oscillate for any combinations or setpoints. Furthermore, the stabilizing effect must appear within certain time limits. Several methods for tuning the PID loop exist. The choice of method will depend largely on whether the process can be taken off-line for tuning or not. Ziegler-Nichols method is a well-known online tuning strategy. The first step in this method is setting the I and D gains to zero, increasing the P gain until a sustained and stable oscillation (as close as possible) is obtained on the output. Then the critical gain K c and the oscillation period P c is recorded and the P, I, and D values adjusted accordingly using the table below. Table 1-1. Ziegler-Nichols Parameters Controller Kp Ti Td P 0.5 * Kc PD 0.65 * Kc 0.12 * Pc PI 0.45 * Kc 0.85 * Pc PID 0.65 * Kc 0.5 * Pc 0.12 * Pc Further tuning of the parameters is often necessary to optimize the performance of the PID controller. The reader should note that there are systems where the PID controller will not work very well, or will only work on a small area around a given system state. Non-linear systems can be such, but generally problems often arise with PID control when systems are unstable and the effect of the input depends on the system state Discrete PID Controller A discrete PID controller will read the error, calculate and output the control input at a given time interval, at the sample period T. The sample time should be less than the shortest time constant in the system Algorithm Background Unlike simple control algorithms, the PID controller is capable of manipulating the process inputs based on the history and rate of change of the signal. This gives a more accurate and stable control method. Figure 1-2 shows the PID controller schematics, where Tp, Ti, and Td denotes the time constants of the proportional, integral, and derivative terms respectively. The transfer function of this system is: = = This gives u with respect to e in the time domain: = d + Approximating the integral and the derivative terms to get the discrete form, using: 0 d = 0 1 = 7

8 Where n is the discrete step at time t. This gives the controller: = = 0 Where: = = To avoid that changes in the desired process value makes any unwanted rapid changes in the control input, the controller is improved by basing the derivative term on the process value only: = = 0 8

9 2. Implementation A working implementation in C is included with this application note. Full documentation of the source code and compilation information is found by opening the readme.html file included with the source code. Figure 2-1. Block Diagram of Demo Application pid.c / pid.h main() PID_timer p_factor, i_factor d_factor setpoint, processvalue control input Init_PID() PID() pid LAST_PROCESS_VALUE SUM_ ERROR P_FACTOR I_FACTOR D_ FACTOR MA X_ERROR MA X_SUM_ ERROR In the figure above a simplified block diagram of the demo application is shown. The PID controller uses a struct to store its status and parameters. This struct is initialized in main, and only a pointer to it is passed to the Init_PID() and PID() functions. The PID() function must be called for each time interval T, this is done by a timer who sets the PID_timer flag when the time interval has passed. When the PID_timer flag is set the main routine reads the desired process value (setpoint) and system process value, calls PID() and outputs the result to the control input. To increase the accuracy the p_factor, i_factor, and d_factor are scaled with a factor 1:128. The result of the PID algorithm is later scaled back by dividing by 128. The value 128 is used to allow for optimizing in the compiler. = 128 Furthermore the effect of the IFactor and DFactor will depend on the sample time T. = 128 = Integral Windup When the process input, u, reaches a high enough value, it is limited in some way. Either by the numeric range internally in the PID controller, the output range of the controller, or constraints in amplifiers or the process itself. This will happen if there is a large enough difference in the measured process value and the reference set point value, typically because the process has a larger disturbance/load than the system is capable of handling. If the controller uses an integral term, this situation can be a problematic. The integral term will sum up as long as the situation last, and when the larger disturbance/load disappear, the PID controller will overcompensate the process input until the integral sum is back to normal. 9

10 This problem can be avoided in several ways. In this implementation the maximum integral sum is limited by not allowing it to become larger than MAX_I_TERM. The correct size of the MAX_I_TERM will depend on the system and sample time used. 10

11 3. Further Development The PID controller presented here is a simplified example. The controller should work fine, but it might be necessary to make the controller even more robust (limit runaway/overflow) in certain applications. Adding saturation correction on the integral term, basing the proportional term on only the system process value can be necessary. In the calculating of IFactor and DFactor the sample time T is a part of the equation. If the sample time T used is much smaller or larger than 1 second, the accuracy for either IFactor or DFactor will be poor. Consider rewriting the PID algorithm and scaling so accuracy for the integral and derivative terms are kept. 11

12 4. Literature References K. J. Astrom & T. Hagglund, 1995: PID Controllers: Theory, Design, and Tuning. International Society for Measurement and Con. 12

13 5. Revision History Doc Rev. Date Comments 2558B 08/2016 New template and some minor changes 2558A 05/2006 Initial document release 13

14 Atmel Corporation 1600 Technology Drive, San Jose, CA USA T: (+1)(408) F: (+1)(408) Atmel Corporation. / Rev.: Atmel, Atmel logo and combinations thereof, Enabling Unlimited Possibilities, AVR, tinyavr, megaavr, and others are registered trademarks or trademarks of Atmel Corporation in U.S. and other countries. Other terms and product names may be trademarks of others. DISCLAIMER: The information in this document is provided in connection with Atmel products. No license, express or implied, by estoppel or otherwise, to any intellectual property right is granted by this document or in connection with the sale of Atmel products. EXCEPT AS SET FORTH IN THE ATMEL TERMS AND CONDITIONS OF SALES LOCATED ON THE ATMEL WEBSITE, ATMEL ASSUMES NO LIABILITY WHATSOEVER AND DISCLAIMS ANY EXPRESS, IMPLIED OR STATUTORY WARRANTY RELATING TO ITS PRODUCTS INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT, CONSEQUENTIAL, PUNITIVE, SPECIAL OR INCIDENTAL DAMAGES (INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS AND PROFITS, BUSINESS INTERRUPTION, OR LOSS OF INFORMATION) ARISING OUT OF THE USE OR INABILITY TO USE THIS DOCUMENT, EVEN IF ATMEL HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. Atmel makes no representations or warranties with respect to the accuracy or completeness of the contents of this document and reserves the right to make changes to specifications and products descriptions at any time without notice. Atmel does not make any commitment to update the information contained herein. Unless specifically provided otherwise, Atmel products are not suitable for, and shall not be used in, automotive applications. Atmel products are not intended, authorized, or warranted for use as components in applications intended to support or sustain life. SAFETY-CRITICAL, MILITARY, AND AUTOMOTIVE APPLICATIONS DISCLAIMER: Atmel products are not designed for and will not be used in connection with any applications where the failure of such products would reasonably be expected to result in significant personal injury or death ( Safety-Critical Applications ) without an Atmel officer's specific written consent. Safety-Critical Applications include, without limitation, life support devices and systems, equipment or systems for the operation of nuclear facilities and weapons systems. Atmel products are not designed nor intended for use in military or aerospace applications or environments unless specifically designated by Atmel as military-grade. Atmel products are not designed nor intended for use in automotive applications unless specifically designated by Atmel as automotive-grade.

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